One-Step Synthesis of Bi2S3/BiOX and Bi2S3/(BiO)2CO3Heterojunction Photocatalysts by Using Aqueous Thiourea Solution as Both Solvent and Sulfur Source

2016 ◽  
Vol 1 (19) ◽  
pp. 6136-6145 ◽  
Author(s):  
Keke Zhang ◽  
Qiaofeng Han ◽  
Xin Wang ◽  
Junwu Zhu
Keyword(s):  
Sulfur Source ◽  
Thiourea Solution ◽  
One Step

scholarly journals Controlled Synthesis of Visible Light Active CuxS Photocatalyst: The Effect of Heat Treatment on Their Adsorption Capacity and Photoactivity

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3665 ◽  
Author(s):  
Szilvia Fodor ◽  
Lucian Baia ◽  
Klára Hernádi ◽  
Zsolt Pap
Keyword(s):  
Heat Treatment ◽  
Photocatalytic Activity ◽  
Adsorption Capacity ◽  
Ethylenediaminetetraacetic Acid ◽  
Sulfur Source ◽  
Chloride Dihydrate ◽  
Stabilizing Agents ◽  
Investigation Methods ◽  
Visible Light Active ◽  
One Step

The effects of different precursor salts, stabilizing agents, and heat treatment parameters are already known to have an influence on the synthesis of nano-sized semiconductors in heterogenous photocatalysis. In the present work, CuxS materials were prepared by using different precursors (copper (II) chloride dihydrate or copper (II) acetate monohydrate) and shape tailoring/stabilizing agents, such as ethylenediaminetetraacetic acid/polyvinylpyrrolidone, and thiourea as the sulfur source. The polyvinylpyrrolidone (PVP) kinetically controlled the growth rate of the nanoplates, while ethylenediaminetetraacetic acid (EDTA) adjusted the nucleation process through the complexation of copper. A one-step hydrothermal method was used for the synthesis, and the materials were characterized by means of morphological and structural complementary investigation methods. Furthermore, the adsorption capacity and photocatalytic activity were also measured for these materials. It was found that the vacancy sites formed by changing the precursor salt, as confirmed by Raman measurements, affect the photocatalytic activity. The rise of the specific surface area was achieved by heat treatment, and concomitantly, the adsorption capacity of the treated samples was found to increase likewise.

One-Step Hydrothermal Synthesis of MoS2 Nano-Flowers with High Surface Area and Crystalline

2012 ◽  
Vol 531-532 ◽  
pp. 508-511 ◽  
Author(s):  
Yan Juan Li ◽  
Nan Li ◽  
Xiao Yan ◽  
Yue Chi ◽  
Qing Yuan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Surface Area ◽  
Ph Value ◽  
High Surface ◽  
High Surface Area ◽  
Ammonium Molybdate ◽  
Molar Ratio ◽  
Sulfur Source ◽  
One Step

One-step and controlled pH hydrothermal synthesis of transition metal disulfide using double molybdenum sources to synthesize MoS2 nano-flowers at low temperature was first reported. Anhydrous molybdenum pentachloride (MoCl5) and four sulfur ammonium molybdate ((NH4) 6Mo7O24•4H2O) were the molybdenum source and CS (NH2) 2 was the sulfur source. Through hydrothermal method, MoS2 was obtained at 180 °C. The pH value of system was controlled by adjusting the molar ratio of MoCl5 and (NH4) 6Mo7O24•4H2O. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), surface area (BET) and transmission electron microscopy (TEM). The results show that the products were hexagonal MoS2 with a high crystalline and flower-like structure consisted of small particles. The thickness of petals is a few to tens of nanometers. By changing the molar ratio of molybdenum sources, the resultant phase from the mixed phase transited to the pure phase and the purity of synthetic MoS2 crystal increaseed.

scholarly journals Bacterial synthesis of PbS nanocrystallites in one-step with l-cysteine serving as both sulfur source and capping ligand

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Shiping Wei ◽  
Ce Guo ◽  
Lijuan Wang ◽  
Jiangfeng Xu ◽  
Hailiang Dong
Keyword(s):  
Surface Characterization ◽  
Blue Shift ◽  
Band Gap Energy ◽  
Sulfur Source ◽  
Lysinibacillus Sphaericus ◽  
Quantum Size ◽  
Naturally Occurring ◽  
Vis Spectroscopy ◽  
One Step

AbstractThe green bacterial biosynthesis of lead sulfide nanocrystallites by l-cysteine-desulfurizing bacterium Lysinibacillus sphaericus SH72 was demonstrated in this work. Nanocrystals formed by this bacterial method were characterized using the mineralogical and morphological approaches. The results revealed that the microbially synthesized PbS nanocrystals assume a cubic structure, and are often aggregated as spheroids of about 105 nm in size. These spheroids are composed of numerous nanoparticles with diameter 5–10 nm. Surface characterization of the bacterial nanoparticles with FTIR spectroscopy shows that the l-cysteine coats the surface of PbS nanoparticle as a stabilizing ligand. The optical features of the PbS nanocrystallites were assessed by UV–Vis spectroscopy and PL spectroscopy. The maximum absorption wavelength of the bacterial PbS particles occurs at 240 nm, and the photoluminescence emission band ranges from 375 to 550 nm. The band gap energy is calculated to be 4.36 eV, compared to 0.41 eV for the naturally occurring bulk PbS, with this clear blue shift attributable to the quantum size effect.

Preparation of a novel chloromethylated polystyrene-2-mercapto-1,3,4-thiadiazole chelating resin and its adsorption properties and mechanism for separation and recovery of Hg(II) from aqueous solutions

2017 ◽  
Vol 76 (7) ◽  
pp. 1915-1924 ◽  
Author(s):  
Huihua Zhou ◽  
Jianjun Zheng ◽  
Hui Wang ◽  
Jianxin Wang ◽  
Xiaoguang Song ◽  
...  
Keyword(s):  
Adsorption Properties ◽  
Adsorption Kinetic ◽  
Chelating Resin ◽  
Order Model ◽  
Adsorption Capacities ◽  
Thiourea Solution ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
One Step ◽  
The Cost

With an efficient methodology, a novel chloromethylated polystyrene-g-2-mercapto-1,3,4-thiadiazole chelating resin (MTR resin) was prepared via a one-step reaction. The structure of MTR resin was characterized by elements analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. Meanwhile, the adsorption properties of the resin for Hg(II) were investigated by batch and column experiments. The results showed that the resin possessed much better adsorption capability for Hg(II) than for other metal ions. The statically and the dynamic saturated adsorption capacities were 343.8 mg/g and 475.1 mg/g. The adsorption kinetic and equilibrium data were well fitted to the second-order model and the Langmuir isotherm model, respectively. Desorption of mercury from the resin can be achieved using 30 mL of 2 mol/L HCl-5% thiourea solution with a desorption ratio of 92.3%. Compared with other absorbents, MTR resin was greatly conserve natural resources and reduce the cost.

Multifunctional Biomedical Applications of Nitrogen and Sulfur Co-Doped Carbon Dots

2021 ◽  
Vol 17 (8) ◽  
pp. 1598-1611
Author(s):  
Dan Zhao ◽  
Rui Zhang ◽  
Mengyu Xu ◽  
Xincai Xiao ◽  
Haiyan Zhao ◽  
...  
Keyword(s):  
Carbon Dots ◽  
Biomedical Application ◽  
Carbon Sources ◽  
Sulfur Source ◽  
Gram Positive ◽  
Gram Positive Bacteria ◽  
One Step ◽  
Onion Epidermal Cells ◽  
Doped Carbon Dots ◽  
Co Doped

Multifunctional carbon dots have drawn considerable attention due to their potential biomedical application value. We report the preparation of blue-green fluorescence-emitting, multifunctional, nitrogen-and-sulfur co-doped carbon dots (N, S-CDs) synthesized via a one-step process using 1-thioglycerol as a sulfur source, glucose and citric acid as carbon sources, and polyethyleneimine as a nitrogen source. Because of abundant amino and sulfur content, the CDs exhibited high sensibility and selectivity for detecting Cu2+ (detection limit: 0.01 μM, linear range: 0.025 to 50 μM). Fast and sensitive detection of tiopronin was also achieved on the basis of the fluorescence “off-on” mode considering the strong affinity between tiopronin and Cu2+. The N, S-CDs exhibited good biocompatibility as determined by fluorescence imaging using onion epidermal cells and gram-positive bacteria. The CDs also exhibited excellent antimicrobial ability against the gram-positive bacteria. Our results indicate that these novel N, S-CDs could be ideal candidates for several biochemical applications such as antibacterial treatment and detection of small biomolecules.

Facile and green one-step synthesis of Ni3S2@CN carbon nanosheets from sodium lignosulfonate for supercapacitor electrode

2021 ◽  
Author(s):  
Dichao Wu ◽  
Changzhou Chen ◽  
Qi Guo ◽  
Ao Wang ◽  
Kang Sun ◽  
...  
Keyword(s):  
Carbon Source ◽  
Sulfur Source ◽  
Sodium Lignosulfonate ◽  
Supercapacitor Electrode ◽  
Carbon Nanosheets ◽  
One Step

A green and facile strategy had been designed to fabricate Ni3S2 doped carbon nanosheets (Ni3S2@CN). In this strategy, the sodium lignosulfonate was introduced as sulfur source and carbon source to...

Effect of sulfur source on photocatalytic degradation performance of CdS/MoS2 prepared with one-step hydrothermal synthesis

2018 ◽  
Vol 65 ◽  
pp. 347-355 ◽  
Author(s):  
Yanfeng Wang ◽  
Wei Chen ◽  
Xiao Chen ◽  
Huajun Feng ◽  
Dongsheng Shen ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Photocatalytic Degradation ◽  
Sulfur Source ◽  
One Step

An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

1976 ◽  
Vol 34 ◽  
pp. 542-543
Author(s):  
R.P. Goehner ◽  
W.T. Hatfield ◽  
Prakash Rao
Keyword(s):  
Electron Diffraction ◽  
Real Time ◽  
Pattern Analysis ◽  
Flow Diagram ◽  
Hard Copy ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

Nutrient-regulated gene expression in eukaryotes

2006 ◽  
Vol 73 ◽  
pp. 85-96 ◽  
Author(s):  
Richard J. Reece ◽  
Laila Beynon ◽  
Stacey Holden ◽  
Amanda D. Hughes ◽  
Karine Rébora ◽  
...  
Keyword(s):  
Gene Expression ◽  
Rna Polymerase ◽  
Rna Polymerase Ii ◽  
Transcriptional Control ◽  
Direct Interaction ◽  
Signalling Pathways ◽  
A Cell ◽  
One Step ◽  
Higher Eukaryotes ◽  
Regulated Gene Expression

The recognition of changes in environmental conditions, and the ability to adapt to these changes, is essential for the viability of cells. There are numerous well characterized systems by which the presence or absence of an individual metabolite may be recognized by a cell. However, the recognition of a metabolite is just one step in a process that often results in changes in the expression of whole sets of genes required to respond to that metabolite. In higher eukaryotes, the signalling pathway between metabolite recognition and transcriptional control can be complex. Recent evidence from the relatively simple eukaryote yeast suggests that complex signalling pathways may be circumvented through the direct interaction between individual metabolites and regulators of RNA polymerase II-mediated transcription. Biochemical and structural analyses are beginning to unravel these elegant genetic control elements.

CAD: One Step Forward, One Step Back

2010 ◽  
Vol 43 (18) ◽  
pp. 16
Author(s):  
MATTHEW R.G. TAYLOR
Keyword(s):  
One Step
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